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Finding the Fourth Proportional to 996.67, 1,375.78 and 856.22

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Solution

The fourth proportional to 996.67, 1,375.78 and 856.22 is: 1,181.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.67 : 1,375.78 = 856.22 : x
  2. Step 2: Convert to fraction form
    996.67/1,375.78 = 856.22/x
  3. Step 3: Cross multiply
    996.67x = 1,375.78 × 856.22
  4. Step 4: Simplify right side
    996.67x = 1,177,971.65
  5. Step 5: Solve for x
    x = 1,177,971.65/996.67
  6. Step 6: Final answer
    x = 1,181.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.